This clip of a cat running into a door.
https://www.youtube.com/watch?v=0H25ve3qts4
Stating a reference to something
Repeating a joke until it's funny
Observational humor, e.g. George Carlin:
https://gamefaqs.gamespot.com/a/user_image/0/8/9/AAVyzqAAC5kZ.jpg
Anything deadpan, e.g. Mitch Hedburg, RIP:
https://gamefaqs.gamespot.com/a/user_image/0/8/8/AAVyzqAAC5kY.jpg